Jules Verne 
An Antarctic Mystery [EPUB ebook] 

A wealthy American Jeorling is looking for a passage back to the USA after private studies of the wildlife on the Kerguelen Islands. Halbrane is one of the first ships to arrive at Kerguelen, and its captain Len Guy somewhat reluctantly agrees to have Jeorling as a passenger as far as Tristan da Cunha. Underway, they meet a stray iceberg with a dead body on it, which turns out to be a sailor from Jane. A note found with him indicates that he and several others including Jane’s captain William Guy had survived the assassination attempt at Tsalal and are still alive.